to think about something that happened in the past, often with mixed feelings
過去に起こったことを考える、しばしば複雑な感情を伴って (kako ni okotta koto o kangaeru, shibashiba fukuzatsu na kanjō o tomonatte)
"When I look back upon my decisions, I wish I had chosen differently."
"自分の決断を振り返ると、違う選択をしていたらよかったと思います。" (watashi ga **look back upon** jibun no ketsudan o furikaeru toki, chigau sentaku o shite itara yokatta to omoimasu)
to reduce the amount of money you owe
to start a computer or device and load its operating system
to switch from an old system to a new one
to continue with courage despite emotional hardship
to respond to a message or email
to investigate or explore potential collaborations
